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vipertech763
vipertech763, automotive technician
Category: Dodge
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1999 dodge: 360 whitch has engine knock the harmonic bal..rod

Resolved Question:

I have a 1999 dodge ram 360 whitch has engine knock the harmonic bal. is wobbling up & down and front to back could this cause what sounds like a rod knock
Submitted: 10 years ago.
Category: Dodge
Expert:  vipertech763 replied 10 years ago.

Good eveniing, if the crank pulley and balancer moves in and out then the thrust bearings are worn out. This can cause the internal noise and also cause the flywheel to contact the back of the block as well. Here is some info about possible noises and causes. As you can see, main bearing noise can be caused by excessive wear on the thrust bearings:

MECHANICAL DIAGNOSIS CHART - GASOLINE ENGINES

CONDITION POSSIBLE CAUSES CORRECTION
NOISY VALVES/LIFTERS 1. High or low oil level in crankcase 1. Check for correct oil level. Adjust oil level by draining or adding as needed
-2. Thin or diluted oil 2. Change oil (Refer to Engine Oil Service in this group)
-3. Low oil pressure 3. Check engine oil level. If ok, Perform oil pressure test. Refer to this group for engine oil pressure test/specifications
-4. Dirt in tappets/lash adjusters 4. Clean/replace hydraulic tappets/lash adjusters
-5. Bent push rod(s) 5. Install new push rods
-6. Worn rocker arms 6. Inspect oil supply to rocker arms and replace worn arms as needed
-7. Worn tappets/lash adjusters 7. Install new hydraulic tappets/lash adjusters
-8. Worn valve guides 8. Inspect all valve guides and replace as necessary
-9. Excessive runout of valve seats or valve faces 9. Grind valves and seats
CONNECTING ROD NOISE 1. Insufficient oil supply 1. Check engine oil level. (Refer toLubrication and Maintenance)
-2. Low oil pressure 2. Check engine oil level. If ok, Perform oil pressure test. Refer to this group for engine oil pressure test/specifications
-3. Thin or diluted oil 3. Change oil to correct viscosity. Refer to this group for correct procedure/engine oil specifications
-4. Excessive connecting rod bearing clearance Measure bearings for correct clearance with plasti-gage. Repair as necessary
-5. Connecting rod journal out of round 5. Replace crankshaft or grind journals
-6. Misaligned connecting rods 6. Replace bent connecting rods
MAIN BEARING NOISE 1. Insufficient oil supply 1. Check engine oil level. (Refer toLubrication and Maintenance)
-2. Low oil pressure 2. Check engine oil level. If ok, Perform oil pressure test. Refer to this group for engine oil pressure test/specifications
-3. Thin or diluted oil 3. Change oil to correct viscosity. Refer to this group for correct procedure/engine oil specifications
-4. Excessive main bearing clearance 4. Measure bearings for correct clearance. Repair as necessary
-5. Excessive end play 5. Check crankshaft thrust bearing for excessive wear on flanges
-6. Crankshaft main journal out of round or worn 6. Grind journals or replace crankshaft
-7. Loose flywheel or torque converter 7. Inspect crankshaft, flexplate/flywheel and bolts for damage. Tighten to correct torque
LOW OIL PRESSURE 1. Low oil level 1. Check oil level and fill if necessary
-2. Faulty oil pressure sending unit 2. Install new sending unit
-3. Clogged oil filter 3. Install new oil filter
-4. Worn oil pump 4. Replace worn gears or oil pump assy
-5. Thin or diluted oi

 

Here are the actual specs for the end play (in and out of the crankshaft)

CRANKSHAFT
Rod Journal
Diameter53.950 - 53.975 mm (2.124 - 2.125 in.)
Out of Round (Max.)0.0254 mm (0.001 in.)
Taper (Max.)0.0254 mm (0.001 in.)
Bearing Clearance0.013 - 0.056 mm (0.0005 - 0.0022 in.)
Service Limit0.0762 mm (0.003 in.)
Main Bearing Journal
Diameter71.361 - 71.387 mm (2.8095 - 2.8105 in.)
Out of Round (Max.)0.127 mm (0.001 in.)
Taper (Max.)0.0254 mm (0.001 in.)
Bearing Clearance (#1 Journal)0.013 - 0.038 mm (0.0005 - 0.0015 in.)
Service Limit (#1 Journal)0.0381 mm (0.0015 in.)
Bearing Clearance (#2-5 Journals)0.013 - 0.051 mm (0.0005 - 0.002 in.)
Service Limit (#2-5 Journals)0.064 mm (0.0025 in.)
Crankshaft End Play
End Play0.051 - 0.178 mm (0.002 - 0.007 in.)
Service Limit0.254 mm (0.010 in.)

 

Any thing more than 0.010 in. requires extensive repairs such as crankshaft and bearing replacement and possibly even engine replacement.

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